The MongoBinData class

简介

An object that can be used to store or retrieve binary data from the database.

The maximum size of a single object that can be inserted into the database
is 16MB. For data that is larger than this (movies, music, Henry Kissinger's
autobiography), use MongoGridFS. For data that is
smaller than 16MB, you may find it easier to embed it within the document
using MongoBinData.

This class contains a type field, which currently gives
no additional functionality in the PHP driver or the database. There are
seven predefined types, which are defined as class constants below. For
backwards compatibility, the PHP driver uses
MongoBinData::BYTE_ARRAY as the default; however, this
may change to MongoBinData::GENERIC in the future.
Users are encouraged to specify a type in
MongoBinData::__construct().